Well, it's midnight, so the timing kind of sucks. I could go to an emergency room, but I'm not even sure there’s much that could be done if it’s traveling through my body. That said, if there are even slight complaints in the morning, I’m going to my local doctor. Mind you im not sure if I should wait till the morning or if its urgent but that is hard to judge as a layman.
But yeah blood isnt a good sign. Even if its not anime coughing up blood levels of blood.
Edit. One good thing the blood seems pinkish now.